US20180163997A1 - Ultra-low temperature freezer - Google Patents
Ultra-low temperature freezer Download PDFInfo
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- US20180163997A1 US20180163997A1 US15/892,146 US201815892146A US2018163997A1 US 20180163997 A1 US20180163997 A1 US 20180163997A1 US 201815892146 A US201815892146 A US 201815892146A US 2018163997 A1 US2018163997 A1 US 2018163997A1
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- refrigeration unit
- ultra
- low temperature
- unit
- mounting board
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/02—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors plug-in type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
-
- F25B41/04—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/04—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors with more than one refrigeration unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/06—Several compression cycles arranged in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/30—Quick freezing
Definitions
- the present disclosure relates to an ultra-low temperature freezer.
- Ultra-low temperature freezers have been developed, which are each configured to cool the interior of a storage compartment to an ultra-low temperature, for example, ⁇ 80° C. or lower to preserve body tissues or store frozen food for a long period of time.
- Such an ultra-low temperature freezer is configured such that, among the component devices of a refrigerant circuit, an evaporator is disposed to surround the storage compartment, while a compressor, a condenser, a decompressor, etc., are housed in a machinery compartment which is provided separately from the storage compartment (see, for example, Japanese Patent No. 5026736).
- An ultra-low temperature freezer including a dual refrigerant circuit also has a similar configuration.
- devices housed in the machinery compartment increase as well as pipes connecting these devices one another also increases, which complicates the interior of the machinery compartment.
- the ultra-low temperature freezer it is desired for the ultra-low temperature freezer to achieve a storage compartment having a larger capacity while minimizing the whole size. Accordingly, further rationalization is demanded of the machinery compartment.
- the present disclosure has been made in view of the above, and an aspect thereof is to provide an ultra-low temperature freezer capable of rationalizing an arrangement of devices in a machinery compartment of the ultra-low temperature freezer having a dual refrigerant circuit, and enhancing maintainability and manufacturing workability.
- An ultra-low temperature freezer comprises: an insulated case defining a storage compartment having an opening in an upper face; an insulated door configured to be able to open and close the opening; a first refrigeration unit configured such that a first compressor, a first condenser, and a first decompressor are mounted on a first mounting board; a second refrigeration unit configured such that a second compressor, a second condenser, and a second decompressor are mounted on a second mounting board; a machinery compartment provided adjacent to the insulated case, the machinery compartment configured to house the first refrigeration unit and the second refrigeration unit so as to be independently drawable in the horizontal direction; and a control unit where a control circuit is mounted, the control unit configured to be drawable independently of the first refrigeration unit and the second refrigeration unit, the first refrigeration unit, the second refrigeration unit, and the control unit being housed in the machinery compartment so as to be stacked in a vertical direction.
- FIG. 1 is an external perspective view illustrating an ultra-low temperature freezer according to an embodiment of the present disclosure.
- FIG. 2 is an external perspective view illustrating a state where an insulated door of an ultra-low temperature freezer according to an embodiment of the present disclosure is opened.
- FIG. 3 is a perspective front view illustrating a storage compartment of an ultra-low temperature freezer according to an embodiment of the present disclosure.
- FIG. 4 is a perspective plan view illustrating a storage compartment of an ultra-low temperature freezer according to an embodiment of the present disclosure.
- FIG. 5 is a perspective side view illustrating a storage compartment of an ultra-low temperature freezer according to an embodiment of the present disclosure.
- FIG. 6 is a diagram illustrating a refrigerant circuit of an ultra-low temperature freezer according to an embodiment of the present disclosure.
- FIG. 7 is a perspective diagram when viewed from a back side of an ultra-low temperature freezer according to an embodiment of the present disclosure.
- FIG. 8 is a plan view illustrating a mounting board for a refrigeration unit according to an embodiment of the present disclosure.
- FIG. 9 is an external perspective view illustrating a mounting board for a refrigeration unit according to an embodiment of the present disclosure.
- FIG. 10 is a diagram illustrating a reinforcing portion of a mounting board according to an embodiment of the present disclosure.
- FIG. 11 is a diagram illustrating a storage rack provided to a machinery compartment according to an embodiment of the present disclosure.
- FIG. 12 is a front view illustrating a mounting board according to an embodiment of the present disclosure.
- FIG. 13 is an external perspective view illustrating a mounting board for a control unit according to an embodiment of the present disclosure.
- FIG. 14 is a diagram illustrating a control circuit according to an embodiment of the present disclosure.
- An ultra-low temperature freezer 1 is a refrigeration apparatus capable of cooling an interior of a storage compartment 4 , which will be described later, to a predetermined temperature or lower (for example, ⁇ 80° C. or lower) of an ultra-low temperature.
- the ultra-low temperature freezer 1 is suitable for the preservation at the ultra-low temperature of frozen food or body tissue and specimen to be preserved at a low temperature for a long period of time.
- FIG. 1 is an external perspective view illustrating the ultra-low temperature freezer 1 according to an embodiment of the present disclosure.
- FIG. 2 is an external perspective view illustrating a state where an insulated door 13 of the ultra-low temperature freezer 1 is opened.
- FIG. 3 is a perspective front view illustrating an interior of the storage compartment 4 of the ultra-low temperature freezer 1 .
- FIG. 4 is a perspective plan view illustrating an interior of the storage compartment 4 of the ultra-low temperature freezer 1 .
- FIG. 5 is a perspective side view illustrating an interior of the storage compartment 4 of the ultra-low temperature freezer 1 .
- a direction from left to right when facing a front face of the ultra-low temperature freezer 1 is defined as a forward direction of an X-axis
- a direction from the front to the rear is defined as a forward direction of a Y-axis
- a vertically upward direction is defined as a forward direction of a Z-axis.
- the ultra-low temperature freezer 1 includes: a substantially rectangular parallelepiped insulated case 2 that defines the storage compartment 4 having an opening on an upper face; the insulated door 13 configured to be able to open and close the opening of the storage compartment 4 ; and a machinery compartment 3 disposed adjacent to and on a side of the insulated case 2 .
- the insulated case 2 includes a front insulated wall 2 A, a rear insulated wall 2 B, a right insulated wall 2 C, a left insulated wall 2 D and an insulated bottom 2 E, and forms the storage compartment 4 in the interior thereof.
- a storage item such as body tissue or food, is stored.
- the front insulated wall 2 A is formed such that a thickness T 1 thereof becomes smaller than a thickness T 2 of the rear insulated wall 2 B, a thickness T 3 of the right insulated wall 2 C, and a thickness T 4 of the left insulated wall 2 D, to facilitate moving of a storage item into and out of the storage compartment 4 .
- the insulated case 2 is configured as such.
- a worker when moving a storage item in and out of the storage compartment 4 , a worker can lifts up and down a storage item at a position closer to the worker's standing place. This can facilitate moving in and out of a storage item. Accordingly, it becomes possible to move a storage item in and out of the storage compartment 4 in a short period of time, thereby being able to reduce a period of time in which the insulated door 13 should be kept open. This can minimize an increase in temperature within the storage compartment 4 .
- a storage item can be lifted up and down at a position closer to a worker's standing place.
- a storage item can be lifted up and down at a position closer to a worker's standing place.
- the insulated door 13 is configured using a plurality of (5 pieces in an embodiment of the present disclosure) pivot members 14 that are disposed side by side along an upper end part of the rear insulated wall 2 B, by pivoting on or being pivotally supported by these pivot members 14 .
- the insulated door 13 is configured to open and close the opening of the insulated case 2 by pivoting on a central axis formed along the upper end part of the rear insulated wall 2 B.
- a handle portion 16 is provided to the insulated door 13 , and a worker operates the handle portion 16 to open and close the insulated door 13 .
- the insulated case 2 includes an inner case 7 whose upper face is configured to be opened, and an outer case 6 surrounding the inner case 7 , a breaker 8 , an insulating material 9 , and a vacuum insulated panel 12 .
- the outer case 6 is configured with a board material made of a steel plate, and is open on the upper side and constitutes outer wall surfaces and outer bottom surface of the insulated case 2 .
- the inner case 7 is configured with a board material made of metal having high thermal conductivity, such as aluminum, and similarly is open on the upper side and constitutes inner wall surfaces and inner bottom surface of the insulated case 2 .
- the breaker 8 is a member made of a synthetic resin, and is mounted to connect between the outer case 6 and the inner case 7 .
- the insulating material 9 is a polyurethane resin filled in a space surrounded by the outer case 6 , the inner case 7 , and the breaker 8 .
- the insulating material 9 is filled in each of the front insulated wall 2 A, the rear insulated wall 2 B, the right insulated wall 2 C, the left insulated wall 2 D and the insulated bottom 2 E of the insulated case 2 .
- the vacuum insulated panel 12 is a member having insulating properties configured such that glass wool is stored in a casing constituted by a multi-layer film, such as aluminum and a synthetic resin, having no air permeability, the air in the casing is discharged by a predetermined vacuum discharge means, and an opening of the casing is joined by thermal welding, or the like.
- the vacuum insulated panel 12 is mounted between the outer case 6 and the aforementioned insulating material 9 filled between the inner case 7 and the outer case 6 .
- the vacuum insulated panel 12 has insulating properties higher than that of the insulating material 9 .
- the combined use of the insulating material 9 and the vacuum insulated panel 12 can achieve insulating properties higher than insulating properties in the case where only the insulating material 9 is used.
- the vacuum insulated panel 12 and the insulating material 9 are used in combination for the front insulated wall 2 A. More specifically, in an embodiment of the present disclosure, the vacuum insulated panel 12 is mounted between the inner case 7 and the outer case 6 in the front insulated wall 2 A.
- FIG. 4 illustrates a state where the ultra-low temperature freezer 1 according to an embodiment of the present disclosure has the vacuum insulated panel 12 in the front insulated wall 2 A.
- the front insulated wall 2 A is formed to have a thickness that is smaller than the thicknesses of the rear insulated wall 2 B, the right insulated wall 2 C, and the left insulated wall 2 D
- the front insulated wall 2 A is able to ensure insulating properties equivalent to the insulating properties of the rear insulated wall 2 B, the right insulated wall 2 C and the left insulated wall 2 D. Accordingly, it becomes possible to restrain power consumption that is necessary for cooling the interior of the storage compartment 4 to a predetermined temperature or lower (for example, ⁇ 80° C. or lower).
- a configuration is made such that only the thickness of the front insulated wall 2 A is reduced while the thicknesses of the rear insulated wall 2 B, the right insulated wall 2 C, and the left insulated wall 2 D are made greater than the thickness of the front insulated wall 2 A.
- This can minimize degradation of strength of the insulated case 2 . Accordingly, reliability, such as failure tolerance and durability, of the ultra-low temperature freezer 1 can also be maintained.
- a configuration is made such that the vacuum insulated panel 12 is mounted between the insulating material 9 and the outer case 6 in the front insulated wall 2 A.
- the vacuum insulated panel 12 is mounted such that the insulating material 9 is interposed between the vacuum insulated panel 12 and the inner case 7 .
- This can minimize reduction in the temperature of the vacuum insulated panel 12 caused by the inner case 7 which is cooled to such a degree equivalent to the degree of cooling the interior of the storage compartment 4 , thereby being able to minimize degradation of insulation performance caused by damage, such as crack, fracture, and rupture, occurring in the vacuum insulated panel 12 . Consequently, reliability, such as failure tolerance and durability of the ultra-low temperature freezer 1 can be maintained.
- the interior of the storage compartment 4 is cooled by a first refrigerant circuit 100 and a second refrigerant circuit 200 .
- the first refrigerant circuit 100 includes a first compressor 101 , condensers 102 , 104 , a decompressor 108 , and a first evaporator 111 , and is configured to cool the interior (storage compartment 4 ) of the insulated case 2 to a predetermined temperature or lower by circulating a refrigerant in this order.
- the second refrigerant circuit 200 includes a second compressor 201 , condensers 202 , 204 , a decompressor 208 , and a second evaporator 211 , and is configured to cool the interior (storage compartment 4 ) of the insulated case 2 to a predetermined temperature or lower by circulating a refrigerant in this order.
- the first evaporator 111 constituting the first refrigerant circuit 100 and the second evaporator 211 constituting the second refrigerant circuit 200 are mounted, to enable heat exchange, so as to surround the storage compartment 4 in a circumferential surface on the insulating material 9 side of the inner case 7 (outer circumferential surface of the inner case 7 ).
- a heat exchanger 109 constituting the first refrigerant circuit 100 and a heat exchanger 209 constituting the second refrigerant circuit 200 are provided, as illustrated in FIG. 4 , within the rear insulated wall 2 B of the insulated case 2 , while being covered with the insulating material 9 . Then, a portion of a rear wall 6 B where the heat exchangers 109 , 209 are provided is covered with a plate-shaped rear surface cover 6 D.
- first compressor 101 the condensers 102 , 104 , and the decompressor 108 constituting the first refrigerant circuit 100 are housed in the machinery compartment 3 , as a first refrigeration unit 500 A which will be described later, together with various devices such as a control circuit 300 of the ultra-low temperature freezer 1 .
- the second compressor 201 , the condensers 202 , 204 , and the decompressor 208 constituting the second refrigerant circuit 200 are housed in the machinery compartment 3 , as a second refrigeration unit 500 B which will be described later, together with various devices such as the control circuit 300 of the ultra-low temperature freezer 1 .
- the control circuit 300 includes a microcomputer 300 a and memory, and is configured to execute a control program for controlling the ultra-low temperature freezer 1 .
- the control circuit 300 is housed in the machinery compartment 3 as a control unit 400 , which will be described later.
- the machinery compartment 3 includes, as illustrated in FIG. 1 , a front panel 3 A, a rear panel 3 D, and a side panel 3 B constituting a side face opposite to the side on which the insulated case 2 is provided. Ventilation slits 3 C are formed in the front panel 3 A and the side panel 3 B.
- an operation panel 21 for operating the ultra-low temperature freezer 1 is provided.
- a measurement hole passes through between the machinery compartment 3 and the insulated case 2 .
- This measurement hole is formed to pass through the outer case 6 constituting the insulated case 2 , the insulating material 9 , and the inner case 7 , so as to communicate between the storage compartment 4 and the machinery compartment 3 . It is possible to insert a temperature sensor 309 , 310 through the measurement hole from the machinery compartment 3 to the interior of the storage compartment 4 .
- a cable is drawn from the temperature sensor 309 , 310 , which is inserted into the storage compartment 4 , to the machinery compartment 3 through the measurement hole.
- the cable is coupled to the control circuit 300 in the machinery compartment 3 .
- a gap formed with the cable is closed with a plug made of a spongelike deformable material having insulating properties. Note that, in a state where the temperature sensor 309 , 310 is not mounted, the measurement hole is closed in an insulating manner with this plug.
- FIG. 6 is a circuit diagram illustrating an example of the refrigerant circuit 150 according to an embodiment of the present disclosure.
- the refrigerant circuit 150 includes two substantially identical refrigerant circuits, that is, the first refrigerant circuit 100 and the second refrigerant circuit 200 .
- the first refrigerant circuit 100 includes the first compressor 101 , the upstream condenser 102 and the downstream condenser 104 , a shunt 107 configured to separate gas and liquid, the decompressor 108 and the heat exchanger 109 , and a decompressor 110 and the first evaporator 111 .
- the first refrigerant circuit 100 is configured in an annular manner so that that a refrigerant discharged from the first compressor 101 is returned to the first compressor 101 again.
- a zeotropic refrigerant mixture hereinafter, simply referred to as the “refrigerant” containing four types of refrigerants, which will be described later, is sealed.
- an oil cooler 101 a is provided at an oil reservoir within the first compressor 101 , a pipe 103 is provided between the upstream condenser 102 and the oil cooler 101 a , a dehydrator 106 is provided between the downstream condenser 104 and the shunt 107 , a buffer 112 is provided between the first compressor 101 on the intake side and the heat exchanger 109 .
- the first refrigerant circuit 100 includes a first fan 105 to cool the upstream condenser 102 and the downstream condenser 104 .
- the first fan 105 is a propeller blower including a fan motor 105 a.
- the first compressor 101 is configured to compress and discharge the intake refrigerant to the upstream condenser 102 .
- the upstream condenser 102 is configured such that, for example, a copper or aluminum tube to radiate the heat of the refrigerant discharged from the first compressor 101 is formed into a meander shape.
- the downstream condenser 104 is configured such that, for example, a copper or aluminum tube to further radiate the heat of the refrigerant outputted from the upstream condenser 102 is formed into a meander shape.
- upstream condenser 102 and downstream condenser 104 are integrally configured in a single tube sheet.
- the shunt 107 is configured to separate the refrigerant outputted from the downstream condenser 104 into the refrigerant in a liquid phase and the refrigerant in a gas phase, and decompress the refrigerant in the liquid phase through the decompressor (capillary tube) 108 , and thereafter evaporate the decompressed refrigerant in an outer tube 109 a of the heat exchanger 109 .
- the heat exchanger 109 is, for example, a metal or aluminum double tube including the outer tube 109 a and an inner tube 109 b .
- the refrigerant in the gas phase from the shunt 107 flows through the inner tube 109 b , and the refrigerant in the gas phase, which is obtained by evaporating the refrigerant in the liquid phase, flowing through the inner tube 109 b is cooled at the outer tube 109 a.
- the decompressor 110 is, for example, a capillary tube, configured to decompress the refrigerant having entered the liquid phase by being cooled at the inner tube 109 b of the heat exchanger 109 , and output the decompressed refrigerant to the first evaporator 111 .
- the first evaporator 111 is, for example, a copper or aluminum tube to evaporate the refrigerant decompressed by the decompressor 110 .
- the first evaporator 111 is, for example, attached to the outer faces except the upper opening of the inner case 7 so as to thermally contact the outer faces. Note that such attachment of the first evaporator 111 is not limited to this, as long as a configuration allowing thermal contact.
- the refrigerant is configured to cool an interior of the inner case 7 by cooling action when being evaporated (vaporized) in the first evaporator 111 .
- This refrigerant having entered the gas phase by evaporation is taken into the compressor 101 in the heat exchanger 109 together with the previously evaporated refrigerant.
- the pipe 103 is provided inside the peripheral portion of the upper face opening of the outer case 6 .
- This peripheral portion of the upper face opening is a portion where packing (not illustrated) mounted to the insulated door 13 closely contact in a state where the aforementioned insulated door 13 is closed, and the high-temperature refrigerant discharged from the compressor 101 flows in the pipe 103 .
- heating by this refrigerant prevents condensation which is caused by cooling from the low-temperature inner case 7 side. This can enhance hermeticity within the outer case 6 .
- the dehydrator 106 is configured to remove moisture contained in the refrigerant.
- the buffer 112 includes a capillary tube 112 a and an expansion tank 112 b , and the amount of the refrigerant that circulates in the first refrigerant circuit 100 is maintained appropriate by taking the refrigerant in the gas phase on the intake side of the first compressor 101 into the expansion tank 112 b through the capillary tube 112 a.
- the second refrigerant circuit 200 includes, similarly to the above, the second compressor 201 , the upstream condenser 202 and the downstream condenser 204 , a shunt 207 configured to separate gas and liquid, the decompressor 208 and the heat exchanger 209 , and a decompressor 210 and the second evaporator 211 .
- the second refrigerant circuit 200 is configured in an annular manner so that a refrigerant discharged from the second compressor 201 is returned to the second compressor 201 again. In the second refrigerant circuit 200 , the refrigerant similar to the above is sealed.
- this second refrigerant circuit 200 includes, similarly to the above, an oil cooler 201 a , a pipe 203 , a dehydrator 206 , and a buffer 212 .
- the heat exchanger 209 includes an outer tube 209 a and an inner tube 209 b .
- the buffer 212 includes a capillary tube 212 a and an expansion tank 212 b.
- a second fan 205 is provided to cool the upstream condenser 202 and the downstream condenser 204 .
- the second fan 205 is a propeller blower including a fan motor 205 a.
- the aforementioned pipe 103 and pipe 203 are provided inside the peripheral portion of the upper face opening of the outer case 6 , for example, so as to overlap each other.
- the aforementioned first evaporator 111 and second evaporator 211 are, for example, attached in such a manner as to thermally contact the outer faces except the upper face opening of the inner case 7 , for example, so as not to overlap each other.
- the refrigerant according to an embodiment of the present disclosure is, for example, a zeotropic refrigerant mixture containing R245fa, R600, R23, and R14.
- R245fa indicates Pentafluoropropane (CHF 2 CH 2 CF 3 ), and has a boiling point of +15.3° C.
- R600 indicates normal butane (n-C 4 H 10 ), and has a boiling point of ⁇ 0.5° C.
- R23 indicates Trifluoromethane (CHF 3 ), and has a boiling point of ⁇ 82.1° C.
- R14 indicates Tetrafluoromethane (CF 4 ), and has a boiling point of ⁇ 127.9° C.
- R600 has a high boiling point (evaporation temperature), and easily contains oil, water, etc.
- R245fa is a refrigerant to be made noncombustible by being mixed with R600, which is combustible, at a predetermined ratio (e.g., R245fa and R600 are in the ratio of 7:3).
- the refrigerant compressed in the first compressor 101 radiates heat in the upstream condenser 102 and the downstream condenser 104 , and is condensed to enter the liquid phase. Then, the refrigerant in the liquid state is subjected to a moisture removal process in the dehydrator 106 , and thereafter is separated, in the shunt 107 , into the refrigerant in the liquid phase (mainly R245fa, R600 having a high boiling temperature) and the refrigerant in the gas state (R23, R14).
- the refrigerant having radiated heat in the upstream condenser 102 cools the oil within the first compressor 101 at the oil cooler 101 a , and thereafter radiates heat again in the downstream condenser 104 .
- the refrigerant in the separated liquid state (mainly R245fa, R600) is decompressed in the decompressor 108 , and thereafter is evaporated at the outer tube 109 a in the heat exchanger 109 .
- the refrigerant in the separated gas state (R23, R14) is cooled and condensed by the heat of evaporation of the aforementioned refrigerant (R245fa, R600) evaporated in the outer tube 109 a and the refrigerant in the gas phase (R23, R14) returned from the first evaporator 111 , while passing through the inner tube 109 b of the heat exchanger 109 , resulting in the refrigerant in the liquid state.
- the refrigerant having not been evaporated in the first evaporator 111 is evaporated.
- the second refrigerant circuit 200 is similar to the above.
- R245fa has a boiling point of about 15° C.
- R600 has a boiling point of about 0° C.
- R23 has a boiling point of about ⁇ 82° C.
- R14 has a boiling point of about ⁇ 128° C. Accordingly, in the first refrigerant circuit 100 and the second refrigerant circuit 200 , R23 and R14 in the zeotropic refrigerant mixture are cooled through vaporization action of R600, and R23, R14 having entered in the liquid phase are guided to the first evaporator 111 and the second evaporator 211 , and evaporated.
- a temperature corresponding to a boiling point of R23 and R14 e.g., about ⁇ 82° C. to ⁇ 128° C.
- control circuit 300 according to an embodiment of the present disclosure will be described with reference to FIG. 14 .
- the control circuit 300 includes a control board 301 , a switching power supply 302 , a power supply switch 304 , compressor relays 305 , and relays 306 , to control the first compressor 101 and the fan motor 105 a of the first refrigerant circuit 100 , and the second compressor 201 and the fan motor 205 a of the second refrigerant circuit 200 .
- control circuit 300 is mounted onto a control-unit-mounting board 410 , and housed in the machinery compartment 3 as the control unit 400 .
- control circuit 300 is configured to be connected to a first compressor temperature sensor 307 configured to detect a temperature of the first compressor 101 , a second compressor temperature sensor 308 configured to detect a temperature of the second compressor 201 , a first temperature sensor 309 configured to detect a temperature within the freezer so as to control the first compressor 101 , a second temperature sensor 310 configured to detect a temperature within the freezer so as to control the second compressor 201 , a first sensor 311 configured to detect a temperature of the first fan 105 , and a second sensor 312 configured to detect a temperature of the second fan 205 .
- the control board 301 includes a microcomputer 301 a , and is configured to output control signals for opening and closing two relays 306 in response to detection signals from the first compressor temperature sensor 307 and the second compressor temperature sensor 308 , and also output control signals for starting or stopping the operations of the fan motor 105 a , 205 a.
- the microcomputer 301 a is configured to, when detecting that a temperature of the first compressor 101 detected by the first compressor temperature sensor 307 has exceeded a predetermined temperature during the operation of the first compressor 101 , operate the compressor relay 305 corresponding to the first compressor 101 through the relay 306 corresponding to the first compressor 101 , thereby interrupting an input of a three-phase voltage to the first compressor 101 .
- This functions as a protection circuit with respect to increase in temperature of the first compressor 101 .
- the first compressor 101 and the second compressor 201 are configured to, when the power supply switch 304 is turned on, be supplied with electric power from three-phase power supply cables 303 , and start an operation of compressing a refrigerant.
- the microcomputer 301 a is configured to, for example, compare a temperature within the freezer detected using the first temperature sensor 309 and a predetermined temperature, and control the rotation speed of a motor (not illustrated) of the first compressor 101 in accordance with the result of such comparison. This controls compression performance of the first compressor 101 according to the temperature within the freezer, and the same applies to the second compressor 201 .
- the first temperature sensor 309 and the second temperature sensor 310 may be the same single sensor.
- the microcomputer 301 a is configured to control the fan motors 105 a , 205 a other than the above-described control of the first compressor 101 and the second compressor 201 . Further, although not illustrated, the microcomputer 301 a is configured to, for example, when detecting that a temperature of the first fan 105 detected with the first sensor 311 has exceeded a predetermined temperature, stop the operation of the fan motor 105 a . This functions as a protection circuit with respect to increase in temperature of the first fan 105 , and the same applies to the second fan 205 . Note that the first sensor 311 and the second sensor 312 may be, for example, a shared single sensor provided adjacent to both the fan motors 105 a , 205 a.
- first refrigeration unit 500 A and second refrigeration unit 500 B are housed so as to be independently drawable in a horizontal direction (Y-axis direction in an embodiment of the present disclosure).
- the machinery compartment 3 includes a control-unit-storage rack 72 for housing the control unit 400 so as to be drawable in the horizontal direction, and a refrigeration-unit-storage rack 62 (first refrigeration-unit-storage rack 62 A, second refrigeration-unit-storage rack 62 B) for housing the refrigeration unit 500 so as to be drawable in the horizontal direction.
- a control-unit-storage rack 72 for housing the control unit 400 so as to be drawable in the horizontal direction
- a refrigeration-unit-storage rack 62 first refrigeration-unit-storage rack 62 A, second refrigeration-unit-storage rack 62 B
- the control unit 400 is configured such that various components such as the control board 301 and the switching power supply 302 , etc., constituting the control circuit 300 are mounted on the control-unit-mounting board 410 made of a substantially rectangular metal plate illustrated in FIG. 13 .
- FIG. 13 is a diagram illustrating the control-unit-mounting board 410 when viewed from a lower surface side opposite to an upper surface where the control circuit 300 is mounted.
- the control-unit-mounting board 410 includes a substantially rectangular main body portion 411 where the control circuit 300 is to be mounted, and reinforcing plates 412 .
- the reinforcing plates 412 are mounted to the main body portion 411 on the lower surface side, along a direction (X-axis direction, lateral direction of the main body portion 411 ) intersecting the direction (Y-axis direction, longitudinal direction of the main body portion 411 ) in which the control unit 400 is drawn out.
- the reinforcing plates 412 are mounted, for example, to the main body portion 411 by welding.
- a mounting hole for mounting a component of the control circuit 300 cannot be created at a location where the reinforcing plates 412 are mounted.
- mounting of the reinforcing plates 412 along the lateral direction of the main body portion 411 can reduce the area covered by the reinforcing plates 412 in the surface area of the main body portion 411 as compared with the case where the reinforcing plates 412 are mounted along the longitudinal direction. This can reduce interference with the reinforcing plate 412 when creating a mounting hole in the main body portion 411 .
- the provision of the reinforcing plates 412 to the control-unit-mounting board 410 can minimize deformation of the control-unit-mounting board 410 caused by the weight of the control unit 400 .
- the main body portion 411 includes folded portions 413 formed by folding edge portions toward a direction (for example, +Z direction) intersecting a surface (X-Y plane) where the control circuit 300 is mounted.
- Such an embodiment can further minimize deformation of the control-unit-mounting board 410 caused by the weight of the control unit 400 .
- the control-unit-storage rack 72 includes a pair of rail members 70 extending in the direction (Y-axis direction) in which the control unit 400 is drawn out, and a transverse member 71 extending in the direction (X-axis direction) of traversing such a drawing put direction.
- the pair of rail members 70 extends in the direction in which the control unit 400 is drawn out in such a manner as to contact the pair of folded portions 413 of the control-unit-mounting board 410 . Then, the control unit 400 is housed into the control-unit-storage rack 72 , with the control-unit-mounting board 410 being supported by the pair of rail members 70 .
- control circuit 300 is mounted on the control-unit-mounting board 410 to be integrally configured as the control unit 400 . This can enhance maintainability and manufacturing workability of the ultra-low temperature freezer 1 .
- control circuit 300 For example, if a component part of the control circuit 300 is broken, the whole control unit 400 where the broken part is mounted can be easily demounted from the machinery compartment 3 . Then, the control unit 400 is replaced with a new one, which enables the repair of such failure in a short period of time.
- the broken part can be repaired or replaced in a state where the whole control unit 400 where the broken part is mounted is demounted from the machinery compartment 3 . Accordingly, such work is not required to be conducted within the small machinery compartment 3 .
- the ultra-low temperature freezer 1 includes, as described above, the first refrigeration unit 500 A and the second refrigeration unit 500 B.
- the first refrigeration unit 500 A is configured such that components, such as the compressor 101 , the condensers 102 , 104 , and the decompressor 108 which constitute the refrigerant circuit 100 , are mounted on a mounting board 510 that is configured with a substantially rectangular metal plate illustrated in FIG. 8 .
- the second refrigeration unit 500 B is also configured such that components, such as the compressor 201 , the condensers 202 , 204 , the decompressor 208 , which constitute the refrigerant circuit 200 , are mounted on a mounting board 510 that is configured with a substantially rectangular metal plate illustrated in FIG. 8 .
- the first refrigeration unit 500 A and the second refrigeration unit 500 B have the same shape as each other, and are configured to be interchangeable with each other.
- the arrangement of the components, such as, the compressor 101 , the condensers 102 , 104 , and the decompressor 108 in the first refrigeration unit 500 A is the same as the arrangement of the components, such as the compressor 201 , the condensers 202 , 204 , and the decompressor 208 , in the second refrigeration unit 500 B.
- FIG. 8 is a diagram illustrating the mounting board 510 when viewed from a lower surface side opposite to an upper surface where the components, such as the compressor 101 , the condensers 102 , 104 , and the decompressor 108 , are mounted.
- the mounting board 510 includes: a substantially rectangular main body portion 511 where the components, such as the compressor 101 , the condensers 102 , 104 , and the decompressor 108 , are mounted; and a reinforcing portion (first reinforcing portion, second reinforcing portion) 512 .
- the reinforcing portion 512 is formed on the lower surface side of the main body portion 511 so as to extend along the direction (Y-axis direction, longitudinal direction of the main body portion 511 ) in which the first refrigeration unit 500 A is drawn out.
- the reinforcing portion 512 is configured, as illustrated in FIG. 10 , such that the metal plate member 512 formed by being bent along a straight line is mounted (for example, welded) to the lower surface of the mounting board 510 , in the direction in which the first refrigeration unit 500 A is drawn out.
- Such a configuration that the mounting board 510 is provided with the reinforcing portion 512 can minimize the deformation of the mounting board 510 caused by the weight of the first refrigeration unit 500 A.
- the reinforcing portion 512 may be formed, for example, by bending the main body portion 511 such that the lower surface thereof is protruded.
- Such an embodiment can also minimize the deformation of the mounting board 510 caused by the weight of the first refrigeration unit 500 A.
- the provision of the reinforcing portion 512 along the longitudinal direction of the main body portion 511 can further minimize the deformation that is caused by its own weight when the first refrigeration unit 500 A is drawn out of or housed into the machinery compartment 3 .
- the main body portion 511 includes a pair of extending portions (first extending portion, second extending portion) 513 formed by folding a pair of side-edge portions toward the lower surface side along the direction (Y-axis direction) in which the first refrigeration unit 500 A is drawn out.
- the extending portions 513 according to an embodiment of the present disclosure are formed such that, as illustrated in FIG.
- the pair of side-edge portions along the Y-axis direction of the main body portion 511 is folded in a direction ( ⁇ Z-axis direction) intersecting a surface (X-Y plane) where the components, such as the compressor 101 , the condensers 102 , 104 , and the decompressor 108 are mounted and then end parts thereof are further folded inward.
- Such an embodiment can minimize the deformation of the mounting board 510 which is caused by the weight of the first refrigeration unit 500 A.
- the main body portion 511 includes a pair of folded portions 514 formed such that a pair of side-edge portions is folded toward the lower surface side along the direction (X-axis direction) intersecting the direction (Y-axis direction) in which the first refrigeration unit 500 A is drawn out.
- Such an embodiment can further minimize the deformation of the mounting board 510 which is caused by the weight of the first refrigeration unit 500 A.
- the pair of extending portions 513 may be configured not only such that the pair of side-edge portions of the main body portion 511 along the direction (Y-axis direction) in which the first refrigeration unit 500 A is taken out is folded toward the lower surface side, but also such that, for example, a pair of plate-like or bar-like members is respectively mounted (for example, welded) to the pair of side-edge portions of the main body portion 511 along the direction (Y-axis direction) in which the first refrigeration unit 500 A is drawn out.
- Such a configuration can also minimize the deformation of the mounting board 510 which is caused by the weight of the first refrigeration unit 500 A.
- the first refrigeration-unit-storage rack 62 A includes a pair of rail members (first rail members) 60 A extending in the direction (Y-axis direction) in which the first refrigeration unit 500 A is drawn out and a transverse member (first support member) 61 A extending in the direction (X-axis direction) intersecting such a drawing-out direction.
- the second refrigeration-unit-storage rack 62 B includes a pair of rail members (second rail members) 60 B extending in the direction (Y-axis direction) in which the second refrigeration unit 500 B is drawn out, and a transverse member (second support member) 61 B extending in the direction (X-axis direction) intersecting such a drawing-out direction.
- first refrigeration-unit-storage rack 62 A and the second refrigeration-unit-storage rack 62 B have the same shape as each other.
- the transverse member 61 A is coupled (for example, welded), from below, to the end portions of the pair of the rail member 60 A on the front side in the drawing-out direction of the first refrigeration unit 500 A, and extends so as to traverse this drawing-out direction.
- the pair of rail members 60 A extends in the drawing-out direction of the first refrigeration unit 500 A so as to contact the pair of extending portions 513 of the mounting board 510 .
- the first refrigeration unit 500 A is housed into the first refrigeration-unit-storage rack 62 A, with the pair of extending portions 513 of the mounting board 510 being supported by the pair of rail members 60 A.
- the first refrigeration unit 500 A is housed into and drawn out of the machinery compartment 3 with a smaller force.
- the mounting board 510 includes the reinforcing portion 512 , and as illustrated in FIG. 12 , the height H 2 of the reinforcing portion 512 is set to a height at which the reinforcing portion 512 contacts the transverse member 61 A when the first refrigeration unit 500 A is drawn out with the pair of extending portions 513 sliding on the pair of rail members 60 A. That is, a difference (H 2 ⁇ H 1 ) between the height H 2 of the reinforcing portion 512 and the height H 1 of the extending portions 513 is equal to or slightly smaller than the plate thickness t 1 of the rail members 60 A.
- the transverse member 61 A contacts the reinforcing portion 512 from below, so that the weight of the first refrigeration unit 500 A is partially supported by the transverse member 61 A. This can minimize the deformation of the mounting board 510 which is caused by the weight of the first refrigeration unit 500 A.
- the first refrigeration unit 500 A is configured such that the components, such as the compressor 101 , the condensers 102 , 104 , and the decompressor 108 , which constitute the first refrigerant circuit 100 are mounted onto the mounting board 510 . This can enhance maintainability and manufacturing workability of the ultra-low temperature freezer 1 .
- a pipe connection portion 501 A of the first refrigeration unit 500 A, where the broken component part is mounted is demounted (for example, cut out) from a pipe on the other side connected to the heat exchanger 109 , and the first refrigeration unit 500 A is drawn from the first refrigeration-unit-storage rack 62 A in the drawing out direction (+Y-axis direction), so that the whole first refrigeration unit 500 A can be easily demounted from the machinery compartment 3 .
- a new first refrigeration unit 500 A is housed in the first refrigeration-unit-storage rack 62 A, and the pipe connection portion 501 A is coupled (for example, welded) to the pipe on the other side, thereby being able to repair such failure in a short period of time.
- first refrigeration unit 500 A and the second refrigeration unit 500 B have the same shape as each other, and are configured so as to be interchangeable with each other.
- first refrigeration-unit-storage rack 62 A and the second refrigeration-unit-storage rack 62 B also have the same shape as each other. Accordingly, the first refrigeration unit 500 A and the second refrigeration unit 500 B are configured so as to be capable of being housed in either of the first refrigeration-unit-storage rack 62 A and the second refrigeration-unit-storage rack 62 B.
- first refrigeration unit 500 A and the second refrigeration unit 500 B in common as the refrigeration unit 500 , in the case of both using the refrigeration unit 500 as the first refrigeration unit 500 A and using it as the second refrigeration unit 500 B.
- This can enhance manufacturing workability, thereby being able to reduce manufacturing costs by virtue of commonality of parts and manufacturing processes, and reduce spare parts inventory.
- first refrigeration unit 500 A and the second refrigeration unit 500 B may not have the same shape as each other.
- the mounting board (first mounting board) 510 used for the first refrigeration unit 500 A and the mounting board (second mounting board) 510 used for the second refrigeration unit 500 B may not have the same shape.
- At least any of the above-described reinforcing portion 512 , extending portions 513 , and folded portions 514 may be formed in either one of the mounting boards 510 .
- at least any of the shapes of the reinforcing portion 512 , the extending portions 513 , and the folded portions 514 may be different between the mounting board (first mounting board) 510 used for the first refrigeration unit 500 A and the mounting board (second mounting board) 510 used for the second refrigeration unit 500 B.
- the arrangement of the components, such as the compressor 101 , the condensers 102 , 104 , and the decompressor 108 , in the first refrigeration unit 500 A and the arrangement of the components, such as the compressor 201 , the condensers 202 , 204 , and the decompressor 208 , in the second refrigeration unit 500 B may not be necessarily the same.
- first refrigeration-unit-storage rack 62 A and the second refrigeration-unit-storage rack 62 B may not have the same shape as each other.
- the pair of first rail members 60 A used for the first refrigeration-unit-storage rack 62 A and the pair of second rail members 60 B used for the second refrigeration-unit-storage rack 62 B may be different in width and/or thickness.
- the transverse member (first support member) 61 A used for the first refrigeration-unit-storage rack 62 A and the transverse member (second support member) 61 B used for the second refrigeration-unit-storage rack 62 B may be different in shape.
- the transverse member 61 may be provided only either one of the first refrigeration-unit-storage rack 62 A and the second refrigeration-unit-storage rack 628 .
- the ultra-low temperature freezer 1 can achieve enhancement of maintainability and ease of manufacturing, by configuring such that the first refrigeration unit 500 A and the second refrigeration unit 500 B are housed in the machinery compartment 3 so as to be drawable therefrom in the horizontal direction.
- the ultra-low temperature freezer 1 according to an embodiment of the present disclosure has been described, however, the above embodiments of the present disclosure are simply to facilitate the understanding of the present disclosure and are not in any way to be construed as limiting the present disclosure.
- the present disclosure may variously be changed or altered without departing from its scope and encompass equivalents thereof.
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Abstract
Description
- This is a continuation application of International Patent Application No. PCT/JP2016/072589 filed Aug. 2, 2016, which claims the benefit of priority to Japanese Patent Application No. 2015-167043 filed Aug. 26, 2015, the full contents of both of which are incorporated herein by reference.
- The present disclosure relates to an ultra-low temperature freezer.
- Ultra-low temperature freezers have been developed, which are each configured to cool the interior of a storage compartment to an ultra-low temperature, for example, −80° C. or lower to preserve body tissues or store frozen food for a long period of time.
- Such an ultra-low temperature freezer is configured such that, among the component devices of a refrigerant circuit, an evaporator is disposed to surround the storage compartment, while a compressor, a condenser, a decompressor, etc., are housed in a machinery compartment which is provided separately from the storage compartment (see, for example, Japanese Patent No. 5026736).
- An ultra-low temperature freezer including a dual refrigerant circuit also has a similar configuration. In this case, devices housed in the machinery compartment increase as well as pipes connecting these devices one another also increases, which complicates the interior of the machinery compartment.
- Thus, in order not to deteriorate the workability of assembly work, maintenance work, and the like for such devices housed in the machinery compartment, consideration is given to, for example, provision of enough space among the devices in the machinery compartment.
- However, in another aspect, it is desired for the ultra-low temperature freezer to achieve a storage compartment having a larger capacity while minimizing the whole size. Accordingly, further rationalization is demanded of the machinery compartment.
- The present disclosure has been made in view of the above, and an aspect thereof is to provide an ultra-low temperature freezer capable of rationalizing an arrangement of devices in a machinery compartment of the ultra-low temperature freezer having a dual refrigerant circuit, and enhancing maintainability and manufacturing workability.
- An ultra-low temperature freezer according to an aspect of the present disclosure comprises: an insulated case defining a storage compartment having an opening in an upper face; an insulated door configured to be able to open and close the opening; a first refrigeration unit configured such that a first compressor, a first condenser, and a first decompressor are mounted on a first mounting board; a second refrigeration unit configured such that a second compressor, a second condenser, and a second decompressor are mounted on a second mounting board; a machinery compartment provided adjacent to the insulated case, the machinery compartment configured to house the first refrigeration unit and the second refrigeration unit so as to be independently drawable in the horizontal direction; and a control unit where a control circuit is mounted, the control unit configured to be drawable independently of the first refrigeration unit and the second refrigeration unit, the first refrigeration unit, the second refrigeration unit, and the control unit being housed in the machinery compartment so as to be stacked in a vertical direction.
- Other features of the present disclosure will become apparent from descriptions of the present specification and of the accompanying drawings.
- For more thorough understanding of the present disclosure and advantages thereof, the following description should be read in conjunction with the accompanying drawings.
-
FIG. 1 is an external perspective view illustrating an ultra-low temperature freezer according to an embodiment of the present disclosure. -
FIG. 2 is an external perspective view illustrating a state where an insulated door of an ultra-low temperature freezer according to an embodiment of the present disclosure is opened. -
FIG. 3 is a perspective front view illustrating a storage compartment of an ultra-low temperature freezer according to an embodiment of the present disclosure. -
FIG. 4 is a perspective plan view illustrating a storage compartment of an ultra-low temperature freezer according to an embodiment of the present disclosure. -
FIG. 5 is a perspective side view illustrating a storage compartment of an ultra-low temperature freezer according to an embodiment of the present disclosure. -
FIG. 6 is a diagram illustrating a refrigerant circuit of an ultra-low temperature freezer according to an embodiment of the present disclosure. -
FIG. 7 is a perspective diagram when viewed from a back side of an ultra-low temperature freezer according to an embodiment of the present disclosure. -
FIG. 8 is a plan view illustrating a mounting board for a refrigeration unit according to an embodiment of the present disclosure. -
FIG. 9 is an external perspective view illustrating a mounting board for a refrigeration unit according to an embodiment of the present disclosure. -
FIG. 10 is a diagram illustrating a reinforcing portion of a mounting board according to an embodiment of the present disclosure. -
FIG. 11 is a diagram illustrating a storage rack provided to a machinery compartment according to an embodiment of the present disclosure. -
FIG. 12 is a front view illustrating a mounting board according to an embodiment of the present disclosure. -
FIG. 13 is an external perspective view illustrating a mounting board for a control unit according to an embodiment of the present disclosure. -
FIG. 14 is a diagram illustrating a control circuit according to an embodiment of the present disclosure. - At least the following matters will be made clear from the present description with reference to the accompanying drawings.
- An
ultra-low temperature freezer 1 according to an embodiment of the present disclosure is a refrigeration apparatus capable of cooling an interior of astorage compartment 4, which will be described later, to a predetermined temperature or lower (for example, −80° C. or lower) of an ultra-low temperature. Theultra-low temperature freezer 1 is suitable for the preservation at the ultra-low temperature of frozen food or body tissue and specimen to be preserved at a low temperature for a long period of time. - ==Configuration of Ultra-Low Temperature Freezer==
-
FIG. 1 is an external perspective view illustrating the ultra-lowtemperature freezer 1 according to an embodiment of the present disclosure.FIG. 2 is an external perspective view illustrating a state where an insulateddoor 13 of the ultra-lowtemperature freezer 1 is opened.FIG. 3 is a perspective front view illustrating an interior of thestorage compartment 4 of the ultra-lowtemperature freezer 1.FIG. 4 is a perspective plan view illustrating an interior of thestorage compartment 4 of the ultra-lowtemperature freezer 1.FIG. 5 is a perspective side view illustrating an interior of thestorage compartment 4 of the ultra-lowtemperature freezer 1. - Note that, in the following description, a direction from left to right when facing a front face of the
ultra-low temperature freezer 1 is defined as a forward direction of an X-axis, a direction from the front to the rear is defined as a forward direction of a Y-axis, and a vertically upward direction is defined as a forward direction of a Z-axis. - The
ultra-low temperature freezer 1 includes: a substantially rectangular parallelepiped insulatedcase 2 that defines thestorage compartment 4 having an opening on an upper face; the insulateddoor 13 configured to be able to open and close the opening of thestorage compartment 4; and amachinery compartment 3 disposed adjacent to and on a side of the insulatedcase 2. - The insulated
case 2 includes a front insulatedwall 2A, a rear insulatedwall 2B, a right insulated wall 2C, a left insulatedwall 2D and an insulatedbottom 2E, and forms thestorage compartment 4 in the interior thereof. In the interior of thestorage compartment 4, a storage item, such as body tissue or food, is stored. - In the
ultra-low temperature freezer 1 according to an embodiment of the present disclosure, as illustrated inFIG. 4 , the frontinsulated wall 2A is formed such that a thickness T1 thereof becomes smaller than a thickness T2 of the rear insulatedwall 2B, a thickness T3 of the right insulated wall 2C, and a thickness T4 of the left insulatedwall 2D, to facilitate moving of a storage item into and out of thestorage compartment 4. - The insulated
case 2 is configured as such. Thus, when moving a storage item in and out of thestorage compartment 4, a worker can lifts up and down a storage item at a position closer to the worker's standing place. This can facilitate moving in and out of a storage item. Accordingly, it becomes possible to move a storage item in and out of thestorage compartment 4 in a short period of time, thereby being able to reduce a period of time in which the insulateddoor 13 should be kept open. This can minimize an increase in temperature within thestorage compartment 4. - Further, a storage item can be lifted up and down at a position closer to a worker's standing place. Thus, it becomes possible to move a storage item in and out in a posture with less strain, thereby being able to enhance safety of the work.
- The insulated
door 13 is configured using a plurality of (5 pieces in an embodiment of the present disclosure)pivot members 14 that are disposed side by side along an upper end part of the rear insulatedwall 2B, by pivoting on or being pivotally supported by thesepivot members 14. The insulateddoor 13 is configured to open and close the opening of the insulatedcase 2 by pivoting on a central axis formed along the upper end part of the rear insulatedwall 2B. Ahandle portion 16 is provided to the insulateddoor 13, and a worker operates thehandle portion 16 to open and close the insulateddoor 13. - Further the insulated
case 2 according to an embodiment of the present disclosure includes aninner case 7 whose upper face is configured to be opened, and anouter case 6 surrounding theinner case 7, abreaker 8, aninsulating material 9, and a vacuum insulatedpanel 12. - The
outer case 6 is configured with a board material made of a steel plate, and is open on the upper side and constitutes outer wall surfaces and outer bottom surface of the insulatedcase 2. Theinner case 7 is configured with a board material made of metal having high thermal conductivity, such as aluminum, and similarly is open on the upper side and constitutes inner wall surfaces and inner bottom surface of the insulatedcase 2. Thebreaker 8 is a member made of a synthetic resin, and is mounted to connect between theouter case 6 and theinner case 7. - The
insulating material 9 is a polyurethane resin filled in a space surrounded by theouter case 6, theinner case 7, and thebreaker 8. The insulatingmaterial 9 is filled in each of the front insulatedwall 2A, the rear insulatedwall 2B, the right insulated wall 2C, the left insulatedwall 2D and the insulatedbottom 2E of the insulatedcase 2. - The vacuum insulated
panel 12 is a member having insulating properties configured such that glass wool is stored in a casing constituted by a multi-layer film, such as aluminum and a synthetic resin, having no air permeability, the air in the casing is discharged by a predetermined vacuum discharge means, and an opening of the casing is joined by thermal welding, or the like. - The vacuum insulated
panel 12 is mounted between theouter case 6 and the aforementioned insulatingmaterial 9 filled between theinner case 7 and theouter case 6. - The vacuum insulated
panel 12 according to an embodiment of the present disclosure has insulating properties higher than that of the insulatingmaterial 9. Thus, the combined use of the insulatingmaterial 9 and the vacuum insulatedpanel 12 can achieve insulating properties higher than insulating properties in the case where only the insulatingmaterial 9 is used. - Accordingly, in the
ultra-low temperature freezer 1 according to an embodiment of the present disclosure, the vacuum insulatedpanel 12 and the insulatingmaterial 9 are used in combination for the frontinsulated wall 2A. More specifically, in an embodiment of the present disclosure, the vacuum insulatedpanel 12 is mounted between theinner case 7 and theouter case 6 in the frontinsulated wall 2A.FIG. 4 illustrates a state where theultra-low temperature freezer 1 according to an embodiment of the present disclosure has the vacuum insulatedpanel 12 in the frontinsulated wall 2A. - With such an embodiment, even in the case where the front
insulated wall 2A is formed to have a thickness that is smaller than the thicknesses of the rearinsulated wall 2B, the right insulated wall 2C, and the leftinsulated wall 2D, the frontinsulated wall 2A is able to ensure insulating properties equivalent to the insulating properties of the rearinsulated wall 2B, the right insulated wall 2C and the leftinsulated wall 2D. Accordingly, it becomes possible to restrain power consumption that is necessary for cooling the interior of thestorage compartment 4 to a predetermined temperature or lower (for example, −80° C. or lower). - Further, a configuration is made such that only the thickness of the front
insulated wall 2A is reduced while the thicknesses of the rearinsulated wall 2B, the right insulated wall 2C, and the leftinsulated wall 2D are made greater than the thickness of the frontinsulated wall 2A. This can minimize degradation of strength of theinsulated case 2. Accordingly, reliability, such as failure tolerance and durability, of theultra-low temperature freezer 1 can also be maintained. - Further, in the
ultra-low temperature freezer 1 according to an embodiment of the present disclosure, as illustrated inFIG. 4 , a configuration is made such that the vacuum insulatedpanel 12 is mounted between the insulatingmaterial 9 and theouter case 6 in the frontinsulated wall 2A. - Accordingly, the vacuum insulated
panel 12 is mounted such that the insulatingmaterial 9 is interposed between the vacuum insulatedpanel 12 and theinner case 7. This can minimize reduction in the temperature of the vacuum insulatedpanel 12 caused by theinner case 7 which is cooled to such a degree equivalent to the degree of cooling the interior of thestorage compartment 4, thereby being able to minimize degradation of insulation performance caused by damage, such as crack, fracture, and rupture, occurring in the vacuum insulatedpanel 12. Consequently, reliability, such as failure tolerance and durability of theultra-low temperature freezer 1 can be maintained. - The interior of the
storage compartment 4 is cooled by a firstrefrigerant circuit 100 and a secondrefrigerant circuit 200. - Although the details will be described later, the first
refrigerant circuit 100 includes afirst compressor 101,condensers decompressor 108, and a first evaporator 111, and is configured to cool the interior (storage compartment 4) of theinsulated case 2 to a predetermined temperature or lower by circulating a refrigerant in this order. - Similarly, the second
refrigerant circuit 200 includes asecond compressor 201,condensers decompressor 208, and asecond evaporator 211, and is configured to cool the interior (storage compartment 4) of theinsulated case 2 to a predetermined temperature or lower by circulating a refrigerant in this order. [0036] - Then, the first evaporator 111 constituting the first
refrigerant circuit 100 and thesecond evaporator 211 constituting the secondrefrigerant circuit 200 are mounted, to enable heat exchange, so as to surround thestorage compartment 4 in a circumferential surface on the insulatingmaterial 9 side of the inner case 7 (outer circumferential surface of the inner case 7). - Further, a
heat exchanger 109 constituting the firstrefrigerant circuit 100 and aheat exchanger 209 constituting the secondrefrigerant circuit 200 are provided, as illustrated inFIG. 4 , within the rearinsulated wall 2B of theinsulated case 2, while being covered with the insulatingmaterial 9. Then, a portion of arear wall 6B where theheat exchangers rear surface cover 6D. - Further, the
first compressor 101, thecondensers decompressor 108 constituting the firstrefrigerant circuit 100 are housed in themachinery compartment 3, as afirst refrigeration unit 500A which will be described later, together with various devices such as acontrol circuit 300 of theultra-low temperature freezer 1. - Similarly, the
second compressor 201, thecondensers decompressor 208 constituting the secondrefrigerant circuit 200 are housed in themachinery compartment 3, as asecond refrigeration unit 500B which will be described later, together with various devices such as thecontrol circuit 300 of theultra-low temperature freezer 1. - The
control circuit 300 includes a microcomputer 300 a and memory, and is configured to execute a control program for controlling theultra-low temperature freezer 1. Thecontrol circuit 300 is housed in themachinery compartment 3 as acontrol unit 400, which will be described later. - The
machinery compartment 3 includes, as illustrated inFIG. 1 , afront panel 3A, a rear panel 3D, and aside panel 3B constituting a side face opposite to the side on which theinsulated case 2 is provided. Ventilation slits 3C are formed in thefront panel 3A and theside panel 3B. - Further, in the
front panel 3A of themachinery compartment 3, anoperation panel 21 for operating theultra-low temperature freezer 1 is provided. - Further, although not illustrated, a measurement hole passes through between the
machinery compartment 3 and theinsulated case 2. This measurement hole is formed to pass through theouter case 6 constituting theinsulated case 2, the insulatingmaterial 9, and theinner case 7, so as to communicate between thestorage compartment 4 and themachinery compartment 3. It is possible to insert atemperature sensor machinery compartment 3 to the interior of thestorage compartment 4. - A cable is drawn from the
temperature sensor storage compartment 4, to themachinery compartment 3 through the measurement hole. The cable is coupled to thecontrol circuit 300 in themachinery compartment 3. Then, in this measurement hole, a gap formed with the cable is closed with a plug made of a spongelike deformable material having insulating properties. Note that, in a state where thetemperature sensor - Next, a
refrigerant circuit 150 of theultra-low temperature freezer 1 according to an embodiment of the present disclosure will be described with reference toFIG. 6 .FIG. 6 is a circuit diagram illustrating an example of therefrigerant circuit 150 according to an embodiment of the present disclosure. - As indicated in an example in
FIG. 6 , therefrigerant circuit 150 includes two substantially identical refrigerant circuits, that is, the firstrefrigerant circuit 100 and the secondrefrigerant circuit 200. - The first
refrigerant circuit 100 includes thefirst compressor 101, theupstream condenser 102 and thedownstream condenser 104, ashunt 107 configured to separate gas and liquid, thedecompressor 108 and theheat exchanger 109, and adecompressor 110 and the first evaporator 111. The firstrefrigerant circuit 100 is configured in an annular manner so that that a refrigerant discharged from thefirst compressor 101 is returned to thefirst compressor 101 again. In the firstrefrigerant circuit 100, for example, a zeotropic refrigerant mixture (hereinafter, simply referred to as the “refrigerant”) containing four types of refrigerants, which will be described later, is sealed. - Further, in this first
refrigerant circuit 100, an oil cooler 101 a is provided at an oil reservoir within thefirst compressor 101, apipe 103 is provided between theupstream condenser 102 and the oil cooler 101 a, adehydrator 106 is provided between thedownstream condenser 104 and theshunt 107, abuffer 112 is provided between thefirst compressor 101 on the intake side and theheat exchanger 109. - Further, the first
refrigerant circuit 100 includes afirst fan 105 to cool theupstream condenser 102 and thedownstream condenser 104. Thefirst fan 105 is a propeller blower including afan motor 105 a. - The
first compressor 101 is configured to compress and discharge the intake refrigerant to theupstream condenser 102. - The
upstream condenser 102 is configured such that, for example, a copper or aluminum tube to radiate the heat of the refrigerant discharged from thefirst compressor 101 is formed into a meander shape. - The
downstream condenser 104 is configured such that, for example, a copper or aluminum tube to further radiate the heat of the refrigerant outputted from theupstream condenser 102 is formed into a meander shape. - These
upstream condenser 102 anddownstream condenser 104 are integrally configured in a single tube sheet. - The
shunt 107 is configured to separate the refrigerant outputted from thedownstream condenser 104 into the refrigerant in a liquid phase and the refrigerant in a gas phase, and decompress the refrigerant in the liquid phase through the decompressor (capillary tube) 108, and thereafter evaporate the decompressed refrigerant in anouter tube 109 a of theheat exchanger 109. - The
heat exchanger 109 is, for example, a metal or aluminum double tube including theouter tube 109 a and aninner tube 109 b. The refrigerant in the gas phase from theshunt 107 flows through theinner tube 109 b, and the refrigerant in the gas phase, which is obtained by evaporating the refrigerant in the liquid phase, flowing through theinner tube 109 b is cooled at theouter tube 109 a. - The
decompressor 110 is, for example, a capillary tube, configured to decompress the refrigerant having entered the liquid phase by being cooled at theinner tube 109 b of theheat exchanger 109, and output the decompressed refrigerant to the first evaporator 111. - The first evaporator 111 is, for example, a copper or aluminum tube to evaporate the refrigerant decompressed by the
decompressor 110. As described above, the first evaporator 111 is, for example, attached to the outer faces except the upper opening of theinner case 7 so as to thermally contact the outer faces. Note that such attachment of the first evaporator 111 is not limited to this, as long as a configuration allowing thermal contact. - The refrigerant is configured to cool an interior of the
inner case 7 by cooling action when being evaporated (vaporized) in the first evaporator 111. This refrigerant having entered the gas phase by evaporation is taken into thecompressor 101 in theheat exchanger 109 together with the previously evaporated refrigerant. - Note that the
pipe 103 is provided inside the peripheral portion of the upper face opening of theouter case 6. This peripheral portion of the upper face opening is a portion where packing (not illustrated) mounted to theinsulated door 13 closely contact in a state where the aforementionedinsulated door 13 is closed, and the high-temperature refrigerant discharged from thecompressor 101 flows in thepipe 103. Thus, heating by this refrigerant prevents condensation which is caused by cooling from the low-temperatureinner case 7 side. This can enhance hermeticity within theouter case 6. Further, thedehydrator 106 is configured to remove moisture contained in the refrigerant. Further, thebuffer 112 includes acapillary tube 112 a and anexpansion tank 112 b, and the amount of the refrigerant that circulates in the firstrefrigerant circuit 100 is maintained appropriate by taking the refrigerant in the gas phase on the intake side of thefirst compressor 101 into theexpansion tank 112 b through thecapillary tube 112 a. - The second
refrigerant circuit 200 includes, similarly to the above, thesecond compressor 201, theupstream condenser 202 and thedownstream condenser 204, ashunt 207 configured to separate gas and liquid, thedecompressor 208 and theheat exchanger 209, and adecompressor 210 and thesecond evaporator 211. The secondrefrigerant circuit 200 is configured in an annular manner so that a refrigerant discharged from thesecond compressor 201 is returned to thesecond compressor 201 again. In the secondrefrigerant circuit 200, the refrigerant similar to the above is sealed. Further, this secondrefrigerant circuit 200 includes, similarly to the above, an oil cooler 201 a, apipe 203, adehydrator 206, and abuffer 212. Here, theheat exchanger 209 includes anouter tube 209 a and aninner tube 209 b. Further, thebuffer 212 includes acapillary tube 212 a and anexpansion tank 212 b. - In the second
refrigerant circuit 200, asecond fan 205 is provided to cool theupstream condenser 202 and thedownstream condenser 204. Thesecond fan 205 is a propeller blower including afan motor 205 a. - Note that the
aforementioned pipe 103 andpipe 203 are provided inside the peripheral portion of the upper face opening of theouter case 6, for example, so as to overlap each other. The aforementioned first evaporator 111 andsecond evaporator 211 are, for example, attached in such a manner as to thermally contact the outer faces except the upper face opening of theinner case 7, for example, so as not to overlap each other. - The refrigerant according to an embodiment of the present disclosure is, for example, a zeotropic refrigerant mixture containing R245fa, R600, R23, and R14. Here, R245fa indicates Pentafluoropropane (CHF2CH2CF3), and has a boiling point of +15.3° C. R600 indicates normal butane (n-C4H10), and has a boiling point of −0.5° C. R23 indicates Trifluoromethane (CHF3), and has a boiling point of −82.1° C. R14 indicates Tetrafluoromethane (CF4), and has a boiling point of −127.9° C.
- Note that R600 has a high boiling point (evaporation temperature), and easily contains oil, water, etc. Further, R245fa is a refrigerant to be made noncombustible by being mixed with R600, which is combustible, at a predetermined ratio (e.g., R245fa and R600 are in the ratio of 7:3).
- In the first
refrigerant circuit 100, the refrigerant compressed in thefirst compressor 101 radiates heat in theupstream condenser 102 and thedownstream condenser 104, and is condensed to enter the liquid phase. Then, the refrigerant in the liquid state is subjected to a moisture removal process in thedehydrator 106, and thereafter is separated, in theshunt 107, into the refrigerant in the liquid phase (mainly R245fa, R600 having a high boiling temperature) and the refrigerant in the gas state (R23, R14). Note that, in an embodiment of the present disclosure, the refrigerant having radiated heat in theupstream condenser 102 cools the oil within thefirst compressor 101 at the oil cooler 101 a, and thereafter radiates heat again in thedownstream condenser 104. - The refrigerant in the separated liquid state (mainly R245fa, R600) is decompressed in the
decompressor 108, and thereafter is evaporated at theouter tube 109 a in theheat exchanger 109. - The refrigerant in the separated gas state (R23, R14) is cooled and condensed by the heat of evaporation of the aforementioned refrigerant (R245fa, R600) evaporated in the
outer tube 109 a and the refrigerant in the gas phase (R23, R14) returned from the first evaporator 111, while passing through theinner tube 109 b of theheat exchanger 109, resulting in the refrigerant in the liquid state. At this time, the refrigerant having not been evaporated in the first evaporator 111 is evaporated. - Note that the second
refrigerant circuit 200 is similar to the above. - Further, as described above, R245fa has a boiling point of about 15° C., R600 has a boiling point of about 0° C., R23 has a boiling point of about −82° C., and R14 has a boiling point of about −128° C. Accordingly, in the first
refrigerant circuit 100 and the secondrefrigerant circuit 200, R23 and R14 in the zeotropic refrigerant mixture are cooled through vaporization action of R600, and R23, R14 having entered in the liquid phase are guided to the first evaporator 111 and thesecond evaporator 211, and evaporated. This can cause an item to be cooled, for example, to a temperature corresponding to a boiling point of R23 and R14 (e.g., about −82° C. to −128° C.). Note that the refrigerant having not been evaporated in the first evaporator 111 and thesecond evaporator 211 is evaporated in theheat exchangers - Next, the
control circuit 300 according to an embodiment of the present disclosure will be described with reference toFIG. 14 . - The
control circuit 300 according to an embodiment of the present disclosure includes acontrol board 301, a switchingpower supply 302, apower supply switch 304, compressor relays 305, and relays 306, to control thefirst compressor 101 and thefan motor 105 a of the firstrefrigerant circuit 100, and thesecond compressor 201 and thefan motor 205 a of the secondrefrigerant circuit 200. - Note that, as will be described later, the above described components of the
control circuit 300 are mounted onto a control-unit-mountingboard 410, and housed in themachinery compartment 3 as thecontrol unit 400. - Then, the
control circuit 300 is configured to be connected to a firstcompressor temperature sensor 307 configured to detect a temperature of thefirst compressor 101, a secondcompressor temperature sensor 308 configured to detect a temperature of thesecond compressor 201, afirst temperature sensor 309 configured to detect a temperature within the freezer so as to control thefirst compressor 101, asecond temperature sensor 310 configured to detect a temperature within the freezer so as to control thesecond compressor 201, afirst sensor 311 configured to detect a temperature of thefirst fan 105, and asecond sensor 312 configured to detect a temperature of thesecond fan 205. - The
control board 301 includes amicrocomputer 301 a, and is configured to output control signals for opening and closing tworelays 306 in response to detection signals from the firstcompressor temperature sensor 307 and the secondcompressor temperature sensor 308, and also output control signals for starting or stopping the operations of thefan motor - The
microcomputer 301 a is configured to, when detecting that a temperature of thefirst compressor 101 detected by the firstcompressor temperature sensor 307 has exceeded a predetermined temperature during the operation of thefirst compressor 101, operate thecompressor relay 305 corresponding to thefirst compressor 101 through therelay 306 corresponding to thefirst compressor 101, thereby interrupting an input of a three-phase voltage to thefirst compressor 101. This functions as a protection circuit with respect to increase in temperature of thefirst compressor 101. The same applies to thesecond compressor 201. - The
first compressor 101 and thesecond compressor 201 are configured to, when thepower supply switch 304 is turned on, be supplied with electric power from three-phasepower supply cables 303, and start an operation of compressing a refrigerant. Further, although not illustrated, themicrocomputer 301 a is configured to, for example, compare a temperature within the freezer detected using thefirst temperature sensor 309 and a predetermined temperature, and control the rotation speed of a motor (not illustrated) of thefirst compressor 101 in accordance with the result of such comparison. This controls compression performance of thefirst compressor 101 according to the temperature within the freezer, and the same applies to thesecond compressor 201. Note that thefirst temperature sensor 309 and thesecond temperature sensor 310 may be the same single sensor. - In addition, as illustrated in an example of
FIG. 14 , themicrocomputer 301 a is configured to control thefan motors first compressor 101 and thesecond compressor 201. Further, although not illustrated, themicrocomputer 301 a is configured to, for example, when detecting that a temperature of thefirst fan 105 detected with thefirst sensor 311 has exceeded a predetermined temperature, stop the operation of thefan motor 105 a. This functions as a protection circuit with respect to increase in temperature of thefirst fan 105, and the same applies to thesecond fan 205. Note that thefirst sensor 311 and thesecond sensor 312 may be, for example, a shared single sensor provided adjacent to both thefan motors - Next, the
machinery compartment 3 of theultra-low temperature freezer 1 according to an embodiment of the present disclosure will be described with reference toFIGS. 7 to 13 . - As illustrated in
FIG. 7 , in themachinery compartment 3, thecontrol unit 400 and a refrigeration unit 500 (first refrigeration unit 500A andsecond refrigeration unit 500B) are housed so as to be independently drawable in a horizontal direction (Y-axis direction in an embodiment of the present disclosure). - Then, as illustrated in
FIG. 11 , themachinery compartment 3 includes a control-unit-storage rack 72 for housing thecontrol unit 400 so as to be drawable in the horizontal direction, and a refrigeration-unit-storage rack 62 (first refrigeration-unit-storage rack 62A, second refrigeration-unit-storage rack 62B) for housing therefrigeration unit 500 so as to be drawable in the horizontal direction. - The
control unit 400 is configured such that various components such as thecontrol board 301 and the switchingpower supply 302, etc., constituting thecontrol circuit 300 are mounted on the control-unit-mountingboard 410 made of a substantially rectangular metal plate illustrated inFIG. 13 . -
FIG. 13 is a diagram illustrating the control-unit-mountingboard 410 when viewed from a lower surface side opposite to an upper surface where thecontrol circuit 300 is mounted. As illustrated inFIG. 13 , the control-unit-mountingboard 410 includes a substantially rectangularmain body portion 411 where thecontrol circuit 300 is to be mounted, and reinforcingplates 412. - The reinforcing
plates 412 are mounted to themain body portion 411 on the lower surface side, along a direction (X-axis direction, lateral direction of the main body portion 411) intersecting the direction (Y-axis direction, longitudinal direction of the main body portion 411) in which thecontrol unit 400 is drawn out. The reinforcingplates 412 are mounted, for example, to themain body portion 411 by welding. - In the control-unit-mounting
board 410, a mounting hole for mounting a component of thecontrol circuit 300 cannot be created at a location where the reinforcingplates 412 are mounted. However, mounting of the reinforcingplates 412 along the lateral direction of themain body portion 411 can reduce the area covered by the reinforcingplates 412 in the surface area of themain body portion 411 as compared with the case where the reinforcingplates 412 are mounted along the longitudinal direction. This can reduce interference with the reinforcingplate 412 when creating a mounting hole in themain body portion 411. - The provision of the reinforcing
plates 412 to the control-unit-mountingboard 410 can minimize deformation of the control-unit-mountingboard 410 caused by the weight of thecontrol unit 400. - Further, as illustrated in
FIG. 13 , themain body portion 411 includes foldedportions 413 formed by folding edge portions toward a direction (for example, +Z direction) intersecting a surface (X-Y plane) where thecontrol circuit 300 is mounted. - Such an embodiment can further minimize deformation of the control-unit-mounting
board 410 caused by the weight of thecontrol unit 400. - As illustrated in
FIG. 11 , the control-unit-storage rack 72 includes a pair ofrail members 70 extending in the direction (Y-axis direction) in which thecontrol unit 400 is drawn out, and atransverse member 71 extending in the direction (X-axis direction) of traversing such a drawing put direction. - The pair of
rail members 70 extends in the direction in which thecontrol unit 400 is drawn out in such a manner as to contact the pair of foldedportions 413 of the control-unit-mountingboard 410. Then, thecontrol unit 400 is housed into the control-unit-storage rack 72, with the control-unit-mountingboard 410 being supported by the pair ofrail members 70. - With such an embodiment, it becomes possible to house/draw the
control unit 400 into/out of themachinery compartment 3 with a smaller force. - Further, as in an embodiment of the present disclosure, the
control circuit 300 is mounted on the control-unit-mountingboard 410 to be integrally configured as thecontrol unit 400. This can enhance maintainability and manufacturing workability of theultra-low temperature freezer 1. - For example, if a component part of the
control circuit 300 is broken, thewhole control unit 400 where the broken part is mounted can be easily demounted from themachinery compartment 3. Then, thecontrol unit 400 is replaced with a new one, which enables the repair of such failure in a short period of time. - Alternatively, the broken part can be repaired or replaced in a state where the
whole control unit 400 where the broken part is mounted is demounted from themachinery compartment 3. Accordingly, such work is not required to be conducted within thesmall machinery compartment 3. - Next, the
refrigeration unit 500 will be described. - The
ultra-low temperature freezer 1 according to an embodiment of the present disclosure includes, as described above, thefirst refrigeration unit 500A and thesecond refrigeration unit 500B. - The
first refrigeration unit 500A is configured such that components, such as thecompressor 101, thecondensers decompressor 108 which constitute therefrigerant circuit 100, are mounted on a mountingboard 510 that is configured with a substantially rectangular metal plate illustrated inFIG. 8 . - Further, the
second refrigeration unit 500B is also configured such that components, such as thecompressor 201, thecondensers decompressor 208, which constitute therefrigerant circuit 200, are mounted on a mountingboard 510 that is configured with a substantially rectangular metal plate illustrated inFIG. 8 . - The
first refrigeration unit 500A and thesecond refrigeration unit 500B according to an embodiment of the present disclosure have the same shape as each other, and are configured to be interchangeable with each other. For example, the arrangement of the components, such as, thecompressor 101, thecondensers decompressor 108 in thefirst refrigeration unit 500A is the same as the arrangement of the components, such as thecompressor 201, thecondensers decompressor 208, in thesecond refrigeration unit 500B. - Thus, in the following, although a description will be made focusing on the
first refrigeration unit 500A to avoid repetition, the same applies to thesecond refrigeration unit 500B. -
FIG. 8 is a diagram illustrating the mountingboard 510 when viewed from a lower surface side opposite to an upper surface where the components, such as thecompressor 101, thecondensers decompressor 108, are mounted. As illustrated inFIG. 8 , the mountingboard 510 includes: a substantially rectangularmain body portion 511 where the components, such as thecompressor 101, thecondensers decompressor 108, are mounted; and a reinforcing portion (first reinforcing portion, second reinforcing portion) 512. - The reinforcing
portion 512 is formed on the lower surface side of themain body portion 511 so as to extend along the direction (Y-axis direction, longitudinal direction of the main body portion 511) in which thefirst refrigeration unit 500A is drawn out. The reinforcingportion 512 is configured, as illustrated inFIG. 10 , such that themetal plate member 512 formed by being bent along a straight line is mounted (for example, welded) to the lower surface of the mountingboard 510, in the direction in which thefirst refrigeration unit 500A is drawn out. Such a configuration that the mountingboard 510 is provided with the reinforcingportion 512 can minimize the deformation of the mountingboard 510 caused by the weight of thefirst refrigeration unit 500A. - Further, the reinforcing
portion 512 may be formed, for example, by bending themain body portion 511 such that the lower surface thereof is protruded. - Such an embodiment can also minimize the deformation of the mounting
board 510 caused by the weight of thefirst refrigeration unit 500A. - The provision of the reinforcing
portion 512 along the longitudinal direction of themain body portion 511 can further minimize the deformation that is caused by its own weight when thefirst refrigeration unit 500A is drawn out of or housed into themachinery compartment 3. - As illustrated in
FIGS. 8 and 9 , themain body portion 511 includes a pair of extending portions (first extending portion, second extending portion) 513 formed by folding a pair of side-edge portions toward the lower surface side along the direction (Y-axis direction) in which thefirst refrigeration unit 500A is drawn out. The extendingportions 513 according to an embodiment of the present disclosure are formed such that, as illustrated inFIG. 9 , the pair of side-edge portions along the Y-axis direction of themain body portion 511 is folded in a direction (−Z-axis direction) intersecting a surface (X-Y plane) where the components, such as thecompressor 101, thecondensers decompressor 108 are mounted and then end parts thereof are further folded inward. - Such an embodiment can minimize the deformation of the mounting
board 510 which is caused by the weight of thefirst refrigeration unit 500A. - Furthermore, in an embodiment of the present disclosure, as illustrated in
FIGS. 8 and 9 , themain body portion 511 includes a pair of foldedportions 514 formed such that a pair of side-edge portions is folded toward the lower surface side along the direction (X-axis direction) intersecting the direction (Y-axis direction) in which thefirst refrigeration unit 500A is drawn out. - Such an embodiment can further minimize the deformation of the mounting
board 510 which is caused by the weight of thefirst refrigeration unit 500A. - Note that the pair of extending
portions 513 may be configured not only such that the pair of side-edge portions of themain body portion 511 along the direction (Y-axis direction) in which thefirst refrigeration unit 500A is taken out is folded toward the lower surface side, but also such that, for example, a pair of plate-like or bar-like members is respectively mounted (for example, welded) to the pair of side-edge portions of themain body portion 511 along the direction (Y-axis direction) in which thefirst refrigeration unit 500A is drawn out. Such a configuration can also minimize the deformation of the mountingboard 510 which is caused by the weight of thefirst refrigeration unit 500A. - As illustrated in
FIG. 11 , the first refrigeration-unit-storage rack 62A includes a pair of rail members (first rail members) 60A extending in the direction (Y-axis direction) in which thefirst refrigeration unit 500A is drawn out and a transverse member (first support member) 61A extending in the direction (X-axis direction) intersecting such a drawing-out direction. - Similarly, the second refrigeration-unit-
storage rack 62B includes a pair of rail members (second rail members) 60B extending in the direction (Y-axis direction) in which thesecond refrigeration unit 500B is drawn out, and a transverse member (second support member) 61B extending in the direction (X-axis direction) intersecting such a drawing-out direction. - Note that the first refrigeration-unit-
storage rack 62A and the second refrigeration-unit-storage rack 62B according to an embodiment of the present disclosure have the same shape as each other. - Thus, in the following, although a description will be made focusing on the first refrigeration-unit-
storage rack 62A to avoid repetition, the same applies to the second refrigeration-unit-storage rack 62B. - The
transverse member 61A is coupled (for example, welded), from below, to the end portions of the pair of therail member 60A on the front side in the drawing-out direction of thefirst refrigeration unit 500A, and extends so as to traverse this drawing-out direction. - Further, the pair of
rail members 60A extends in the drawing-out direction of thefirst refrigeration unit 500A so as to contact the pair of extendingportions 513 of the mountingboard 510. - Then, the
first refrigeration unit 500A is housed into the first refrigeration-unit-storage rack 62A, with the pair of extendingportions 513 of the mountingboard 510 being supported by the pair ofrail members 60A. - With such an embodiment, the
first refrigeration unit 500A is housed into and drawn out of themachinery compartment 3 with a smaller force. - Further, as described above, the mounting
board 510 includes the reinforcingportion 512, and as illustrated inFIG. 12 , the height H2 of the reinforcingportion 512 is set to a height at which the reinforcingportion 512 contacts thetransverse member 61A when thefirst refrigeration unit 500A is drawn out with the pair of extendingportions 513 sliding on the pair ofrail members 60A. That is, a difference (H2−H1) between the height H2 of the reinforcingportion 512 and the height H1 of the extendingportions 513 is equal to or slightly smaller than the plate thickness t1 of therail members 60A. - With such a configuration, when the
first refrigeration unit 500A is drawn out from the first refrigeration-unit-storage rack 62A, thetransverse member 61A contacts the reinforcingportion 512 from below, so that the weight of thefirst refrigeration unit 500A is partially supported by thetransverse member 61A. This can minimize the deformation of the mountingboard 510 which is caused by the weight of thefirst refrigeration unit 500A. - Note that, as in an embodiment of the present disclosure, the
first refrigeration unit 500A is configured such that the components, such as thecompressor 101, thecondensers decompressor 108, which constitute the firstrefrigerant circuit 100 are mounted onto the mountingboard 510. This can enhance maintainability and manufacturing workability of theultra-low temperature freezer 1. - For example, if a part of a component, such as the
compressor 101, constituting the firstrefrigerant circuit 100 is broken, as illustrated inFIG. 7 , apipe connection portion 501A of thefirst refrigeration unit 500A, where the broken component part is mounted, is demounted (for example, cut out) from a pipe on the other side connected to theheat exchanger 109, and thefirst refrigeration unit 500A is drawn from the first refrigeration-unit-storage rack 62A in the drawing out direction (+Y-axis direction), so that the wholefirst refrigeration unit 500A can be easily demounted from themachinery compartment 3. Then, a newfirst refrigeration unit 500A is housed in the first refrigeration-unit-storage rack 62A, and thepipe connection portion 501A is coupled (for example, welded) to the pipe on the other side, thereby being able to repair such failure in a short period of time. - Alternatively, it becomes possible to repair or replace the broken part in a state where the whole
first refrigeration unit 500A where the broken part is mounted is demounted from themachinery compartment 3. This can also avoid working within thenarrow machinery compartment 3. - Further, as described above, the
first refrigeration unit 500A and thesecond refrigeration unit 500B according to an embodiment of the present disclosure have the same shape as each other, and are configured so as to be interchangeable with each other. Then, the first refrigeration-unit-storage rack 62A and the second refrigeration-unit-storage rack 62B according to an embodiment of the present disclosure also have the same shape as each other. Accordingly, thefirst refrigeration unit 500A and thesecond refrigeration unit 500B are configured so as to be capable of being housed in either of the first refrigeration-unit-storage rack 62A and the second refrigeration-unit-storage rack 62B. - Thus, it is possible to manufacture the
first refrigeration unit 500A and thesecond refrigeration unit 500B in common as therefrigeration unit 500, in the case of both using therefrigeration unit 500 as thefirst refrigeration unit 500A and using it as thesecond refrigeration unit 500B. This can enhance manufacturing workability, thereby being able to reduce manufacturing costs by virtue of commonality of parts and manufacturing processes, and reduce spare parts inventory. - Note that the
first refrigeration unit 500A and thesecond refrigeration unit 500B may not have the same shape as each other. - For example, the mounting board (first mounting board) 510 used for the
first refrigeration unit 500A and the mounting board (second mounting board) 510 used for thesecond refrigeration unit 500B may not have the same shape. - Specifically, at least any of the above-described reinforcing
portion 512, extendingportions 513, and foldedportions 514 may be formed in either one of the mountingboards 510. Alternatively, at least any of the shapes of the reinforcingportion 512, the extendingportions 513, and the foldedportions 514 may be different between the mounting board (first mounting board) 510 used for thefirst refrigeration unit 500A and the mounting board (second mounting board) 510 used for thesecond refrigeration unit 500B. - Further, the arrangement of the components, such as the
compressor 101, thecondensers decompressor 108, in thefirst refrigeration unit 500A and the arrangement of the components, such as thecompressor 201, thecondensers decompressor 208, in thesecond refrigeration unit 500B may not be necessarily the same. - Further, the first refrigeration-unit-
storage rack 62A and the second refrigeration-unit-storage rack 62B may not have the same shape as each other. - For example, the pair of
first rail members 60A used for the first refrigeration-unit-storage rack 62A and the pair ofsecond rail members 60B used for the second refrigeration-unit-storage rack 62B may be different in width and/or thickness. Further, the transverse member (first support member) 61A used for the first refrigeration-unit-storage rack 62A and the transverse member (second support member) 61B used for the second refrigeration-unit-storage rack 62B may be different in shape. Alternatively, the transverse member 61 may be provided only either one of the first refrigeration-unit-storage rack 62A and the second refrigeration-unit-storage rack 628. - Even in such embodiments, the
ultra-low temperature freezer 1 according to an embodiment of the present disclosure can achieve enhancement of maintainability and ease of manufacturing, by configuring such that thefirst refrigeration unit 500A and thesecond refrigeration unit 500B are housed in themachinery compartment 3 so as to be drawable therefrom in the horizontal direction. - Hereinabove, the
ultra-low temperature freezer 1 according to an embodiment of the present disclosure has been described, however, the above embodiments of the present disclosure are simply to facilitate the understanding of the present disclosure and are not in any way to be construed as limiting the present disclosure. The present disclosure may variously be changed or altered without departing from its scope and encompass equivalents thereof.
Claims (11)
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JP2015167043 | 2015-08-26 | ||
PCT/JP2016/072589 WO2017033680A1 (en) | 2015-08-26 | 2016-08-02 | Ultra-low temperature freezer |
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PCT/JP2016/072589 Continuation WO2017033680A1 (en) | 2015-08-26 | 2016-08-02 | Ultra-low temperature freezer |
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US10704808B2 US10704808B2 (en) | 2020-07-07 |
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US15/892,146 Active 2036-11-26 US10704808B2 (en) | 2015-08-26 | 2018-02-08 | Ultra-low temperature freezer |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114222894A (en) * | 2019-06-14 | 2022-03-22 | 克林格股份有限公司 | Dual redundant cooling system for containers |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
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Also Published As
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WO2017033680A1 (en) | 2017-03-02 |
CN107923689A (en) | 2018-04-17 |
JPWO2017033680A1 (en) | 2018-06-14 |
EP3321610A4 (en) | 2018-09-19 |
JP6431986B2 (en) | 2018-11-28 |
EP3321610A1 (en) | 2018-05-16 |
CN107923689B (en) | 2020-05-19 |
EP3321610B1 (en) | 2020-04-01 |
US10704808B2 (en) | 2020-07-07 |
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